package thread;

/**
 * 每个线程循环 1w 次，累加变量 count 的值，count 默认值为 0，注意线程安全问题。
 */
class Count{
    volatile public int num = 0;
    synchronized public void Increase(){
        num++;
    }
}
public class demo33 {
    public static Count count = new Count();
    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(()->{
            for (int i = 0; i < 10000; i++) {
                count.Increase();
            }
        });
        Thread t2 = new Thread(()->{
            for (int i = 0; i < 10000; i++) {
                count.Increase();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count.num);
    }
}
